Hello Richard Roso Yagou, if you are going to prepare for clat then you must have to focus on reasoning and vocabulary because this are going to help you in legal knowledge as well and other aspect is general knowledge which is very rapid section which can score you maximum marks in lesser time. for reasoning and maths you can follow R.S. aggarwal and analytical M.K.pandey and english arihant and word power are best follow current affairs for g.k. there are many open mock tests on inernet you can give and many other coaching centres are providing study material online also. study hard good luck

Firstly know the syllabus of CLAT 2018. You need to focus more on the topics to study-

   Quantitative Ability  
    Number System
    Average
    Percentage
    Profit and Loss
    Time Speed and Distance
    Cube
    Time and Work

    Logical Reasoning

    Non-Verbal Reasoning-
    Number and Letter Series
    Odd man out
    Coding and Decoding
    Calendars
    Symbols and Notions
    Liner, Circular & Grid Arrangement
    Distribution
    Verbal Reasoning
    Direction Sense and Blood Relations
    Statement and Assumption
    Statement and Conclusion
    Strong and Weak Arguments
    Course of Action

     English
    Grammar
    Correct use of sentences
    Spotting errors
    Sentence correction
    Idioms & Phrases
    Foreign Words

    Legal Aptitude
    Torts
    Contract
    Criminal Law
    Constitutional Law
    Legal Terms

G.K & Current Affairs:

    Current events
    Legal judgements
    Sports news
    Business news
    Political news
    Film & television

The books you can refer given below-

Analytical Reasoning by M. K.Pandey
Objective Arithmetic by R.S. Aggarwal
Verbal Reasoning by R.S. Aggarwal
Analytical and Logical Reasoning by R.S. Aggarwal

You can also refer Career Launcher Material.

Good Luck!